Means for securing prefabricated reinforced concrete bunker sections



Nov. 11, 1969 LUDING PREFABRICATED REINFORCE F/g I G. MEANS FOR SECURINGCONCRETE BUNKER SECTIONS Filed June 19, 1967 ArraAA/W United StatesPatent 3,477,396 MEANS FOR SECURING PREFABRICATED REIN- FORCED CONCRETEBUNKER SECTIONS Gustave Luding, Saganer Str. 1, Nuremberg- Langwasser,Germany Filed June 19, 1967, Ser. No. 648,187 Int. Cl. Eg 1/02 US. Cl.109-1 2 Claims ABSTRACT OF THE DISCLOSURE Prefabricated bunker units areprovided with alignable steel half-sections in which are securedshear-resistant inserts pressed into the wall sections of units and areformed as wedges. Concrete fill is provided between the adjacent unitswhich also have air escape holes.

BACKGROUND OF THE INVENTION According to an inventive concept describedin a companion application, the known steel reinforced concrete sectionsof a bunker installation are joined by means of a floor slab to resistshearing stresses. This is effected by the provision of projectingportions which are secured to a bottom armor plate, the floor slabprojecting laterally from the bunker and increasing in thickness fromits edge portions towards the middle.

In order to provide a shear-resistant, gas and watertight connection ofthe individual sections at their parting planes, it is proposed,according to the invention, to provide oppositely anchored steelhalf-sections in which are mounted, transversely to the parting planes,shearresistant inserts, pressed into the wall sections, of wedge orwedge-like design.

A further modification of the invention resides in the provision ofrecesses in the parting plane of the bunker sections, for receiving aquantity of poured concrete; air slots for allowing the escape of airduring the pouring; an asbestos cord on both sides of the recesses andthe shear-resistant inserts in the upper ends of the recesses. Apenetration of heat waves into the concrete fill is thus prevented incase of a catastrophe and thus a flow of heated concrete, therebyassuring a gas and watertight connection.

The invention is illustrated in the accompanying drawing, in which:

FIG. 1 is an elevational view, partly in section, showing the connectingportions of a pair of bunkers;

FIGS. 2 and 3 are enlarged details of the construction of FIG. 1;

FIG. 4 shows a modification of the insert means and FIG. 5 iscross-section, on a horizontal plane, through a parting zone of adjacentbunker sections.

The reinforced concrete bunker sections 1 have a floor slab 6 providedwith armor on their bottom faces. The floor slab 6 projects outwardly ofthe bunker parts and ice increases in thickness from the outer edgestowards the middle. The individual bunker sections 1 are secured to oneanother by bolts 8. The bunker sections 1 are provided with semi-annularrecesses for the steel inserts 9, in which are embedded anchors 10. Thehalf sections are preferably of oval shape; however, they could also beof any other shape, for example sextagonal. Shearresistant inserts areprovided in the half-sections transversely to the parting line of thebunker sections and are pressed by means of a key 12 against steelsection wall.

In FIG. 4 both shear-resistant inserts are of wedge-like construction.

Recesses 13 are provided in the parting plane under the steel inserts 9,and are formed with slots 14 for the escape of air. Asbestos cord 15 isinserted on both sides of the recesses 13. The recesses 13 are filledwith a concrete filler 16, which the air escapes through the slotsduring the pouring of the concrete.

I claim:

1. A bunker shell assembly comprising at least a pair of adjacentindependent bunker shells secured to one another, each of said bunkershells having at least one pair of vertically extending spaced walls ofrectangular cross-section defining an opening in each of said bunkershells, the walls of one of said bunker shells aligned with therespective walls of the other bunker shell, said walls having oppositelydisposed semi-annular recesses, semiannular steel inserts anchored insaid semi-annular recesses, a pair of shear-resistant inserts receivedin each pair of adjacent steel inserts and bolts extending through saidoppositely disposed Wall sections, respectively, said shear-resistantinserts being of wedge-like cross-section and a wedge key insertedbetween said shear-resistant inserts.

2. A bunker assembly as claimed in claim 1, further provided withconcrete filler recesses under said steel inserts, concrete filler insaid concrete filler recesses, said concrete filler recesses havingslots for the escape of air, and asbestos cord inserted between saidadjacent walls of each bunker shells on both sides of said semi-annularrecesses.

References Cited UNITED STATES PATENTS 1,006,354 10/1911 Burgess 287-2031,045,691 11/1912 Fischer 52-586 3,099,110 7/1963 Spaight 109-153,359,022 12/ 1967 Russell 52-586 FOREIGN PATENTS 1,031,666 6/ 1966-Great Britain.

REINALDO P. MACHADO, Primary Examiner US. Cl. X.R. 52-586

